REFLECTIVE SURFACES FOR PPG SIGNAL DETECTION

摘要

Reflective surfaces for the apertures of PPG optical components in PPG systems is disclosed. In a PPG system or device, the addition of reflective surfaces around, under, or near the apertures of the optical components can enhance the amount of light received by the light detector. As a result, the measured PPG signal strength can be higher and more accurate compared to the same PPG device without reflective surfaces. The reflective surfaces can reflect and/or recycle light that is incident upon the reflective surfaces back into the skin for eventual capture of the light by the light detectors. In some examples, the reflective surfaces can be diffuse or specular reflectors and/or can be configured to selectively reflect one or more wavelengths of light. In some examples, the back crystal and/or component mounting plane of the PPG system can be made of the same material as the reflective surfaces.

主权项

1. An electronic device comprising:
one or more light emitters configured to generate one or more light paths through one or more apertures; one or more sensors configured to detect a reflection of the one or more light paths; one or more reflective surfaces in contact with the one or more apertures; and logic coupled to the one or more sensors and configured to detect a signal from the one or more reflected light paths.